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A series of salts, solvates and co-crystals formed by reaction of the isomers of lutidine and picoline with pamoic acid have been prepared and characterised. These reactions were carried out in the solvents DMF and NMP in an attempt to understand the role of the solvent in the structure type observed. A total of 16 new structures are described and compared to the known structures of lutidinium pamoate previously obtained from neat lutidine or from THF. A number of structural features previously observed in these systems reappear in this study, as well as some entirely novel structure types. The solvent does not only fulfill a space-filling role, but rather seems to influence the state of ionisation of the pamoate moiety, which appears to be the major contributor to the crystal structure observed.
The catalyzed pathway has a lower Ea, but the net change in energy that results from the reaction is not affected by the presence of a catalyst. Quality Control of 2,4-Dimethylpyridine, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 108-47-4, in my other articles.
Reference：
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis